Setup the BeagleBone Black with Motorola Atrix Lapdock
Make a backup first; edit /boot/uboot/uEnv.txt
Comment out optargs, then add a line:

## Graphics for Altrix
optargs=quiet drm.debug=7 capemgr.disable_partno=BB-BONELT-HDMI video=HDMI-A-1:1360x768M@60

Edit /etc/X11/xorg.conf (make a backup first)

Section "Module"
Load "extmod"
Load "dbe"
Load "glx"
Load "freetype"
Load "type1"
Load "record"
Load "dri"
EndSection

Section "Monitor"

Identifier "Builtin Default Monitor"
EndSection

Section "Monitor"
Identifier "MotoAttach"
VendorName "MOT"
ModelName "MotoAttach"
HorizSync 30-85
VertRefresh 50-75

Modeline "1360x768@60" 84.50 1360 1392 1712 1744 768 783 791 807 +hsync +vsync
Modeline "1280x720@50" 74.25 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
EndSection

Section "Device"
Identifier "Builtin Default fbdev Device 0"
Driver "modesetting"
EndSection

Section "Screen"
Identifier "Builtin Default fbdev Screen 0"
Device "Builtin Default fbdev Device 0"
#Monitor "Builtin Default Monitor"
Monitor "MotoAttach"
DefaultDepth 16
EndSection

Section "ServerLayout"
Identifier "Builtin Default Layout"

Screen "Builtin Default fbdev Screen 0"
EndSection